1=pod 2 3=head1 NAME 4 5SSL_accept_stream, SSL_get_accept_stream_queue_len, SSL_ACCEPT_STREAM_NO_BLOCK - 6accept an incoming QUIC stream from a QUIC peer 7 8=head1 SYNOPSIS 9 10 #include <openssl/ssl.h> 11 12 #define SSL_ACCEPT_STREAM_NO_BLOCK 13 14 SSL *SSL_accept_stream(SSL *ssl, uint64_t flags); 15 16 size_t SSL_get_accept_stream_queue_len(SSL *ssl); 17 18=head1 DESCRIPTION 19 20The SSL_accept_stream() function attempts to dequeue an incoming stream from the 21given QUIC connection SSL object and returns the newly allocated QUIC stream SSL 22object. 23 24If the queue of incoming streams is empty, this function returns NULL (in 25nonblocking mode) or waits for an incoming stream (in blocking mode). This 26function may still return NULL in blocking mode, for example if the underlying 27connection is terminated. 28 29The caller is responsible for managing the lifetime of the returned QUIC stream 30SSL object; for more information, see L<SSL_free(3)>. 31 32This function will block if the QUIC connection SSL object is configured in 33blocking mode (see L<SSL_set_blocking_mode(3)>), but this may be bypassed by 34passing the flag B<SSL_ACCEPT_STREAM_NO_BLOCK> in I<flags>. If this flag is set, 35this function never blocks. 36 37Calling SSL_accept_stream() if there is no default stream already present 38inhibits the future creation of a default stream. See L<openssl-quic(7)>. 39 40SSL_get_accept_stream_queue_len() returns the number of incoming streams 41currently waiting in the accept queue. 42 43These functions can be used from multiple threads for the same QUIC connection. 44 45Depending on whether default stream functionality is being used, it may be 46necessary to explicitly configure the incoming stream policy before streams can 47be accepted; see L<SSL_set_incoming_stream_policy(3)>. See also 48L<openssl-quic(7)/MODES OF OPERATION> for more information on default stream 49functionality. 50 51=head1 RETURN VALUES 52 53SSL_accept_stream() returns a newly allocated QUIC stream SSL object, or NULL if 54no new incoming streams are available, or if the connection has been terminated, 55or if called on an SSL object other than a QUIC connection SSL object. 56L<SSL_get_error(3)> can be used to obtain further information in this case. 57 58SSL_get_accept_stream_queue_len() returns the number of incoming streams 59currently waiting in the accept queue, or 0 if called on an SSL object other than 60a QUIC connection SSL object. 61 62=head1 SEE ALSO 63 64L<openssl-quic(7)/MODES OF OPERATION>, L<SSL_new_stream(3)>, 65L<SSL_set_blocking_mode(3)>, L<SSL_free(3)> 66 67=head1 HISTORY 68 69SSL_accept_stream() and SSL_get_accept_stream_queue_len() were added in OpenSSL 703.2. 71 72=head1 COPYRIGHT 73 74Copyright 2002-2023 The OpenSSL Project Authors. All Rights Reserved. 75 76Licensed under the Apache License 2.0 (the "License"). You may not use 77this file except in compliance with the License. You can obtain a copy 78in the file LICENSE in the source distribution or at 79L<https://www.openssl.org/source/license.html>. 80 81=cut 82
